So i have an evo 9. full bolt ons / cams / fp red turbo / e85 tune yada yada yada... been running perfect. had a cheap buschur racing style intake pipe.

last night i swapped it out for a fp 84mm silicon intake pipe. now my car is running like complete ***. first start up today it started, idled perfect for about 5 seconds, then died down and cut off. started back up, did the same thing.

3rd time it stayed on fine and i took it down the street and it feels like its hesitating and jerking when getting on the throttle a little. on one short pull it was showing mid 13s AFRs at wot so i let off.

whats it sound like to you guys?

 

Is it running the MAF or speed density?

 

maf

 

Make sure you don't have any leaks allowing air into the intake after the MAF.

 

May sound like a stupid question, but is the maf plugged in? I know if left unplugged it would definitely run pretty crappy.

 

sounds like MAF. if everything is plugged in slap on a buddy's maf and see what happens. but check for vac/boost leaks.

 

Maf is plugged in yes. I can't find anything that seems like it would be leaking. I do have a spare maf so I will try it tomorrow and let y'all know.

Another thing I did that shouldn't matter is my TurboSmart dual port bov, I switched the trumpet and recirc valves around. Probably not a big deal but worth mentioning?

 

Put your recirc valve back the way it was to eliminate it as a possible cause of the problem. I don't know about that recirc valve specifically but 1. with a maf it should be recirculating 100% of the air back into the intake and 2. spring pressure and setup of the valve can have a pretty large effect on driveability.

 

With a different intake you probably need a retune.

 

Alright guys. No idea whats going on.

I switched back to the old intake hoping to get rid of the headache at least until i get the car to my tuner... The car is now running decently, just now it's pulling AFRs in the 13s at WOT from 3rd gear. Before it was perfectly tuned pulling low 11 afrs at wot.

I tried a different maf. Didn't help. I ditched the turbosmart dual port for a forge recirc valve and it did not help either.

I bought a tactrix 2.0 open port cable and downloaded evoscan & ecuflash the other day and hooked everything up to just check everything out but NEVER flashed anything whatsoever so theres no way the tune could/should have changed.

Is it possible i have a bad tank of e85?

 

AFR's going lean would mean E content went up. And to go from miss 11's to 12's means it would've went up a lot. Have you done a boost leak test?

 

I haven't but I just can't grasp where a boost leak could be happening. The car was perfect before this intake ordeal and I've probably re installed this intake 5 times now.

Started it up this morning (keep in mind, everything is back to the setup that was normal just a week ago)

The car idled up pretty high, dropped down to like 400rpms, stumbled but jumped back up to normal idle. Then dipped down a couple more times before finally getting stable.

 

what are you LTFT Mid and Low?

 

Got a log guys. 3rd gear from 3k to 8k just about. i am new to this logging stuff and software. some things didn't log apparently like the fuel trims, etc? or theres just no value for some reason. i am trying to learn fast.

but i attached the log. please let me know if anything looks way out of place.

another thing i noticed is its pushing more boost than it should be. it was tuned at 29psi and it crept up to 31psi on this pull. and today its pretty warm here. 82 degrees F

 

you should re-order the logged items in evoscan to group all the relevant stuff together. What kind of map sensor are you using? It looks like your still on the stocker or something because your logged MAP only shows up to like 3psi. You need to log load either 1byte if your using tephramod or 2-byte by modifying your MUT table. You didnt capture your AFR in the log either, what kind of wideband are you using and are you connecting it to your laptop or is it wired into your ecu? You are also getting knock which is pulling timing.